Figures reported by the European Union's statistics office confirmed the effects of budget-cutting programs on countries that use the euro currency. Even with widespread spending cuts, overall debt rose to 87.2 percent, the highest level since the euro was created.

Separately, a survey of the euro zone's manufacturing and services sectors unexpectedly fell in April.

U.S. government bond prices rose as traders shifted money into assets considered safe. The price of the 10-year Treasury note rose 50 cents for every $100 invested. That pushed its yield down to 1.92 percent from 1.96 percent late Friday.

Wal-Mart Stores sank 4 percent following a report in The New York Times about an alleged bribery campaign involving top executives at a Mexican subsidiary. The retailer said it was investigating for any breach of the U.S Foreign Corrupt Practices Act.